scroodriver = {}

scroodriver.ROTATE_FACE = 1
scroodriver.ROTATE_AXIS = 2
scroodriver.disallow = function(pos, node, user, mode, new_param2)
	return false
end
scroodriver.rotate_simple = function(pos, node, user, mode, new_param2)
	if mode ~= scroodriver.ROTATE_FACE then
		return false
	end
end

-- For attached wallmounted nodes: returns true if rotation is valid
-- simplified version of minetest:builtin/game/falling.lua#L148.
local function check_attached_node(pos, rotation)
	local d = minetest.wallmounted_to_dir(rotation)
	local p2 = vector.add(pos, d)
	local n = minetest.get_node(p2).name
	local def2 = minetest.registered_nodes[n]
	if def2 and not def2.walkable then
		return false
	end
	return true
end

scroodriver.rotate = {}

local facedir_tbl = {
	[scroodriver.ROTATE_FACE] = {
		[0] = 1, [1] = 2, [2] = 3, [3] = 0,
		[4] = 5, [5] = 6, [6] = 7, [7] = 4,
		[8] = 9, [9] = 10, [10] = 11, [11] = 8,
		[12] = 13, [13] = 14, [14] = 15, [15] = 12,
		[16] = 17, [17] = 18, [18] = 19, [19] = 16,
		[20] = 21, [21] = 22, [22] = 23, [23] = 20,
	},
	[scroodriver.ROTATE_AXIS] = {
		[0] = 4, [1] = 4, [2] = 4, [3] = 4,
		[4] = 8, [5] = 8, [6] = 8, [7] = 8,
		[8] = 12, [9] = 12, [10] = 12, [11] = 12,
		[12] = 16, [13] = 16, [14] = 16, [15] = 16,
		[16] = 20, [17] = 20, [18] = 20, [19] = 20,
		[20] = 0, [21] = 0, [22] = 0, [23] = 0,
	},
}

scroodriver.rotate.facedir = function(pos, node, mode)
	local rotation = node.param2 % 32 -- get first 5 bits
	local other = node.param2 - rotation
	rotation = facedir_tbl[mode][rotation] or 0
	return rotation + other
end

scroodriver.rotate.colorfacedir = scroodriver.rotate.facedir

local wallmounted_tbl = {
	[scroodriver.ROTATE_FACE] = {[2] = 5, [3] = 4, [4] = 2, [5] = 3, [1] = 0, [0] = 1},
	[scroodriver.ROTATE_AXIS] = {[2] = 5, [3] = 4, [4] = 2, [5] = 1, [1] = 0, [0] = 3}
}

scroodriver.rotate.wallmounted = function(pos, node, mode)
	local rotation = node.param2 % 8 -- get first 3 bits
	local other = node.param2 - rotation
	rotation = wallmounted_tbl[mode][rotation] or 0
	if minetest.get_item_group(node.name, "attached_node") ~= 0 then
		-- find an acceptable orientation
		for i = 1, 5 do
			if not check_attached_node(pos, rotation) then
				rotation = wallmounted_tbl[mode][rotation] or 0
			else
				break
			end
		end
	end
	return rotation + other
end

scroodriver.rotate.colorwallmounted = scroodriver.rotate.wallmounted

local arrowrotations = {
	{x=0,y=0,z=0},
	{x=1.5,y=0,z=0},
	{x=-1.5,y=0,z=0},
	{x=0,y=0,z=1.5},
	{x=0,y=0,z=-1.5},
	{x=3.14,y=0,z=0},
}

-- Handles rotation
scroodriver.handler = function(itemstack, user, pointed_thing, mode, uses)

	if pointed_thing.type ~= "node" then
		return
	end

	local pos = pointed_thing.under
	local player_name = user and user:get_player_name() or ""

	if minetest.is_protected(pos, player_name) then
		minetest.record_protection_violation(pos, player_name)
		return
	end

	local node = minetest.get_node(pos)
	local ndef = minetest.registered_nodes[node.name]
	if not ndef then
		return itemstack
	end
	-- can we rotate this paramtype2?
	local fn = scroodriver.rotate[ndef.paramtype2]
	if not fn and not ndef.on_rotate then
		return itemstack
	end

	local should_rotate = true
	local new_param2
	if fn then
		new_param2 = fn(pos, node, mode)
	else
		new_param2 = node.param2
	end

	-- Node provides a handler, so let the handler decide instead if the node can be rotated
	if ndef.on_rotate then
		-- Copy pos and node because callback can modify it
		local result = ndef.on_rotate(vector.new(pos),
				{name = node.name, param1 = node.param1, param2 = node.param2},
				user, mode, new_param2)
		if result == false then -- Disallow rotation
			return itemstack
		elseif result == true then
			should_rotate = false
		end
	elseif ndef.on_rotate == false then
		return itemstack
	elseif ndef.can_dig and not ndef.can_dig(pos, user) then
		return itemstack
	end

	if should_rotate and new_param2 ~= node.param2 then
		node.param2 = new_param2
		--!do wallmounted
		if ndef.paramtype2 == "facedir" then
			local rotation = (new_param2 % 32);
			local axis = (rotation - (rotation % 4))/ 4;
			local arrow = minetest.add_entity(pos, "scroodriver:arrow_item")
			arrow:set_rotation(arrowrotations[axis+1])
		end

		minetest.swap_node(pos, node)
		minetest.check_for_falling(pos)
	end

	if not (creative and creative.is_enabled_for and
			creative.is_enabled_for(player_name)) then
		itemstack:add_wear(65535 / ((uses or 200) - 1))
	end

	return itemstack
end

-- scroodriver
minetest.register_tool("scroodriver:scroodriver", {
	description = "Scroodriver (left-click rotates face, right-click rotates axis)",
	inventory_image = "scroodriver.png",
	on_use = function(itemstack, user, pointed_thing)
		scroodriver.handler(itemstack, user, pointed_thing, scroodriver.ROTATE_FACE, 200)
		return itemstack
	end,
	on_place = function(itemstack, user, pointed_thing)
		scroodriver.handler(itemstack, user, pointed_thing, scroodriver.ROTATE_AXIS, 200)
		return itemstack
	end,
})


minetest.register_craft({
	output = "scroodriver:scroodriver",
	recipe = {
		{"default:tin_ingot"},
		{"group:stick"}
	}
})

minetest.register_node("scroodriver:arrow", {
	tiles = {
		"scroodriver_arrows.png",
		"scroodriver_arrows.png^[transformFX]",
	},
	drawtype = "nodebox",
	paramtype = "light",
	node_box = {
		type = "fixed",
		fixed = {
			{-0.5, -0.05, -0.5, 0.5, 0.05, 0.5}, -- NodeBox1
		}
	}
})


minetest.register_entity("scroodriver:arrow_item", {
	visual = "wielditem",
	visual_size = {x=1.33, y=1.33},
	collisionbox = {0},
	physical = false,
	glow = -1, -- disable lighting
	textures = {"scroodriver:arrow"},
	_time = 0,
	on_step = function(self , dtime)
		self._time = self._time+1

		if (self._time > 20) then
			self.object:remove()
		end
	end
})


minetest.register_alias("scroodriver:scroodriver1", "scroodriver:scroodriver")
minetest.register_alias("scroodriver:scroodriver2", "scroodriver:scroodriver")
minetest.register_alias("scroodriver:scroodriver3", "scroodriver:scroodriver")
minetest.register_alias("scroodriver:scroodriver4", "scroodriver:scroodriver")
